Title text: I'm teaching every 8-year-old relative to say this, and every 14-year-old to do the same thing with Toy Story. Also, Pokemon hit the US over a decade ago and kids born after Aladdin came out will turn 18 next year.
No hidden meaning here, but this sure is scary. What's being implied here is that time is moving really quickly and we're getting older faster than we think. Events that seem like they "just happened" have happened long enough ago for a whole other person to come into existence, grow up, and learn to carry on a conversation.
September 11, 2001 was the day several terrorists flew airplanes into several famous buildings in the U.S. Most famously both the North and South towers of the World Trade Center collapsed after planes flew into them. Another plane flew into the Pentagon. A fourth plane, United Flight 93 appears to have been headed for the Capitol Building, but the passengers managed to overcome the hijackers and crash the plane in a field. All non-essential flights over the United States were grounded for quite some time.
In America and elsewhere it is considered one of the most infamous events in recent history and thus a distinctive marker for the passage of time, in contrast to the more contrived examples mentioned in the title text. Furthermore, as an intensely traumatic event for the American public, even for those not directly affected by the attack, anyone not old enough at the time would often be regarded as unable to fully appreciate the impact of the event, further emphasizing the age difference between Rob and his nephew.
- [Rob and his nephew are sitting on the ground. Rob is holding a flashlight up to his face.]
- Rob: But they NEVER FOUND THE GHOST'S HEAD!
- Nephew: Lame story, Uncle Rob.
- Rob: And you could do scarier?
- Nephew: Sure.
- Rob: Try me.
- Nephew: 9/11 happened before I was born, yet I'm old enough to have this conversation with you.
- [Rob has dropped the flashlight.]
- [Rob has curled up and wrapped his arms around himself.]